I've found that 1) asking a direct question/asking for advice helps and 2) I'll link to my blog post on twitter and ask for advice/responses, and that helps as well. I've also found that the more I comment on other peoples' blog posts, the more likely I am to get responses. It builds a relationship and a sense of community! Also: when people leave a comment, I reply.
Getting comments is a pretty difficult thing to get started! It's a lot easier for readers, even regular and invested readers, to passively read the site and keep moving as opposed to taking initiative and investing their time in leaving a comment. It can be pretty hard to engage your readers! Keep producing quality posts and it'll happen, though.